Compression ratios?

I know that the 4.9 liter has the 9.5:1 compression ratio, and to my understanding the MPFI 4.5 liter does too, but I would like to know what the compression ratio for the TBI 4.5 liter from an '89 Deville is. I heard somewhere it is 8.5:1 or so, but I am not real sure.

The reason I ask is because I'm about to buy a 4.5 liter block for a replacement of the engine that's in my '89 Deville right now, and I wanted to have some extra work done to the engine for better fuel economy and performance. I plan on dumping the current engine that's in there now into my '86 Fleetwood so I'll have it running.